Acoustic Signals and Behavior of the Invasive Freshwater Crayfish Cherax destructor (Clark, 1936)

The study of acoustic signals in aquatic animals contributes to developing new monitoring systems based on passive acoustics and improves our knowledge their behaviors ecology. Here, the sounds produced by invasive species crayfish Cherax destructor possible role intraspecific interactions are analyzed. Synchronized video were used a tank record associated behavioral events (tail flips, number encounters, fights) states (velocity distance moved, angular velocity, duration fighting proximity). monitored seven layouts combining males (M) females (F) (F, M, FF, MM, MF, MMF, FFM). Both two types (high- low-frequency sounds). Grouped fewer than single animals. In grouped layout, more recorded when proximity (distance between specimen less 6 cm). not with specific event or state. emitted FF group M significantly higher those other layouts. Our indicates that non-accidentally provide baseline for future tests communication this species. This could help implement low-cost able identify negative effect its dispersion non-native environment.